218191368 has 32 divisors (see below), whose sum is σ = 560223360. Its totient is φ = 70764480.

The previous prime is 218191357. The next prime is 218191387. The reversal of 218191368 is 863191812.

218191368 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×218191368² = 95214946139422848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121968 + ... + 123743.

It is an arithmetic number, because the mean of its divisors is an integer number (17506980).

Almost surely, 2^218191368 is an apocalyptic number.

It is an amenable number.

218191368 is an abundant number, since it is smaller than the sum of its proper divisors (342031992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218191368 is a wasteful number, since it uses less digits than its factorization.

218191368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245757 (or 245753 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 218191368 is about 14771.3021768563. The cubic root of 218191368 is about 602.0222211567.

The spelling of 218191368 in words is "two hundred eighteen million, one hundred ninety-one thousand, three hundred sixty-eight".